Closed cell foam cushions
You might save some money but you will not come close to the quality of these new era boat cushions. We got some from c-cushions 4 years ago and are very impressed. The rubber coating keeps them impervious to water and salt. They are easy to clean and they don''t slide around. Very comfortable too. We chose c-cushions at the time over bottomsiders because the edges were rounded. I think bottomsiders are doing the same thing now. Either, IMHO are well worth it.